So far every means ______ tried, but we still haven’t found anything helpful to

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问题 So far every means ______ tried, but we still haven’t found anything helpful to the case.

选项 A、has been
B、is
C、are
D、have been

答案 A

解析句子意为：每种办法都试过了，但是我们仍然没有发现任何对这个案子有帮助的线索。so far意为：到目前为止，常常和现在完成时态连用。

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Thomaswascheerfuland(help)______，andwesoonbecamegoodfriends．helpful空格前面有